Advertising device



June 36, 1931. w. NOWACK ET AL ADVERTISING DEVICE Filed ifiarch 14. 1929 Patented June 30, 1931 UNITED STATES PATENT OFFICE WILHELM N OWACK, F BERLIN, AND HAN S BUWERT, 0F BERLIN -WILHER8DOBF,

' i GERMANY h ADVERTISING :onvron Application filed March 14, 1929, Serial Nd 347,119, and in Germany September- 4 1928.

This invention relates' to apparatus for the projecting of changing pictures for advertising and other purposes.

In the projecting of advertising and like 6 pictures the changing has a rule hitherto been effected by hand, which, having regard to the great heating of the projecting apparatus, is associated with a. certain amount of danger, and furthermore also results in the 1 disadvantage that the intervals of time between successive individual projections prove more or less irregular. v

The object of the present invention is to remove this objection and to provide a device which will effect the changing of the pictures projected in a. completely automatic ..manner and at exactly equal intervals of time. i This object is attained according to the invention owin to the fact that the pictures to be pro ected rest in a carrier provided with suitable window apertures, which is fed forward by means of a ratchet mechanism at regular intervals by an amount corresponding to the distance between two successive pictures.

One constructional example of the invention is illustrated in the accompanying drawings, in which Figure 1 is an elevation view of the appas ratus, and

Figure 2 is a diagrammatic view of the projection plant as a whole, on a smaller scale. p a

The ratchet feeding device consists of a preferably U-shaped frame 1, which is secured in any convenient manner to aibase plate 2, and serves to support a shaft 3,

. upon which, outside the frame 1, a disc 9 of glass or other transparent material is nonrotatably mounted. The disc serves for the reception of the pictures 5 to be projected, which are slid into pocket-like compartments 7 each provided with a window-like notch, in a further disc consisting of two sheets of paper stuck together. This paper disc is stuck on to the glass disc 4t on one side in such a manner that its v61 dow notches also form as it were windows the disc 4. Between the two limbsfi of the frame 1 is 14: rotatably secured to a support 13 on the secured upon the shaft '3 a ratchet star havin a number of pointed arms correspondlng to the number of picture windows. With this ratchet star 6 there co-operates a second ratchet star 7 which has ratchet arms 8 bent at right angles at the ends. This second ratchet star 7 is mounted fast upon the shaft 9 of a clockwork mechanism 10, which exhibits the usual construction of such springmechanisms, and, by means of a locking lever 11, which-can co-operate with a member 12 of the clock work mechanism, is 4 set into and out of operation as required. As soon as the clockworkmechanism 10,bythe raising of the locking lever 11, is set going, and the ratchet star 7, 8 thereby set in rotation, the arm 8 of the ratchet star 7, which is atthe time directed towards the ratchet star 6 comes into touch, in the position shown in full lines in Figure 1, with one of the arms of the ratchet star 6, and takes with it, in its'angular rotation, the said arm of the ratchet star 6, and therebytakes the ratchet star itself into the position shown in dot and dash lines, and then releases it again. The ratchet star 6 now remains in this position of rest until, after a more or less considerable further angular rotation of the ratchet star 7, 8, the next arm 8, directed upwards in Figure 1, comes into touch with the next arm of the ratchet star 6, and there- 7 by brin s about a further partial rotation of the rate et star 6, and therefore of the disc 4. The disc 4 is accordingly rotated and stopped intermittently, together with the pictures 5 carried by it, the duration of each period of rest corresponding to the desired duration of turer In order to keepthe picture which is being projectedat any particular time accurately in the projection position, there co-opcrates with the ratchet star 6 a pressure arm projection of an individual picbase plate 2, the said pressure arm being con- 95 stantly subject to the action of a pressure spring 15, and imparting an impulse to the ratchet arm 6 until the points of two of its arms bear upon the pressure Surface of the arm 14. Obviously the force of the no 15 should then not be so great as to overcome the pressure of the ratchet star 7, 8.

In order to facilitate altering the pictures to be projected, the disc 4 is preferably secured to the shaft 6 in a readily releasable manner.

The projecting of the pictures 5 is effected by means of a suitable projector, which according to Fig. 2 preferably consists of a source of light 16, a set of lenses 17, a mirror 18, and a roughened or other receiving surface 19. It would obviously also be possible for the projecting of the pictures to tance equal to the distance between two ad-v j be eflected directly upon a suitable screen surface.

What we claim is:-

' Apparatus for projecting changing ad-' vertisement and other pictures, comprising a carrier in the form of a composite rotatable disc consisting of a transparent disc and two sheets of paper formed with window-like notch-shaped openings registering with one another, the paper sheets being stuck top 1 ge'ther except round the margins of the notchshaped openings and being stuck on to one side of the transparent disc, slides bearing the pictures to be projected,'adapted to rest in the compartments formed by the free margins of the n'otch-shapedopenings in the paper discs, and a ratchet mechanism adapted to feed the carrier'forward intermittently at regular intervals of time through a disj acent pictures.

5.\ In testimony whereof we have signed our names to this specification. r

' WILHELM NOWACK. v

HANS BUWERT. 

